Remove remnants of Solaris/PowerPC support

When removing Solaris/PowerPC support, I missed a couple of references.
This patch removes them.

Tested with crosses to ppc-unknown-linux-gnu and powerpc-ibm-aix7.

2025-09-17  Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>

	* configure.ac <powerpcle-*-solaris*>: Remove.
	* configure: Regenerate.

	bfd:
	* config.bfd <powerpcle-*-solaris2*>: Remove.

	gas:
	* configure.tgt <ppc-*-solaris*>: Remove.